Conventional and dissipative solitons in a CFBG-based fiber laser mode-locked with a graphene–nanotube mixture

A graphene–nanotube mode-locked tandem fiber laser with a chirped fiber Bragg grating (CFBG) is proposed, for the first time to our best knowledge. This laser is composed of two resonators with opposite net dispersions, and it delivers a conventional soliton (CS) and a dissipative soliton (DS) simultaneously. The CS operated in a net-anomalous-dispersion cavity has a spectral width of ∼0.59 nm and a pulse duration of ∼5 ps, and the DS is operated in another cavity with a pulse duration of ∼15.3 ps. By using a piece of single-mode fiber, the DS can be compressed to ∼6.5 ps, while the CS is gradually broadened up to ∼9 ps. (letters)